New Dell Latitude owners may notice an unknown device in their device manager. Here’s how to find out what it is and the solution to what mine was.

In Device Manager, right-click the device and click Properties. Under the details tab, choose Hardware ID from the drop box. You’ll see something like ACPI\SMO8800 (that’s what the unknown device was on mine). Google that hardware ID and you’ll find that it’s an accelerometer, a device that detects when your laptop may be falling and instantly stops the hard disk so it isn’t damaged on impact.

For those with the specific ACPI\SMO8800 device, here’s a link to Dell’s driver for
the freefall sensor.

Additionally, you may find this unknown device identifier utility useful.

About Beecher Bowers


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  1. Thanks for this tip. It worked after downloading the following drivers:

    ST Microelectronics-Driver

  2. That worked for me. Thanks for the info!

  3. Hi, it worked in my Vostro Notebook 3500 .

  4. worked great for my dell 502LX. thank you!!!!!!

  5. please for me

  6. Kudos for finding this !!! Worked great on my E6510. I actually remembering unsintalling it because I was cleaning this laptop for a new user and didn’t know what it was. Oops !! Thanks again.

  7. Gurumurthy June 26, 2011 at 6:49 pm · ·

    thank you it will works to dell xps L501X

  8. Great, thanks! Worked on Latitude E6410 :-)

  9. Worked for a E6410 too + Nate’s comment a handy reminder. Many thanks

  10. Thank you so much for such a smart solution! Nothing helped until I found your post. Great job!

  11. Additionally…i noticed the driver listed is a bit old. You can find the newest version of the free fall sensor driver at Dells website after putting in your service tag and going under the Applications tab. At the very bottom should be the latest version.

  12. worked on my E6510…thank you!

  13. Like Tim, I too google searched for the ACPI\SMO8800 and this is the first hit I got. Resolved my issue with my E6410. Thanks!

  14. Thank you! YOu just made my day easier. This worked on a Dell Lat E6410

  15. Worked for a dell l502x

  16. Thanks so much worked with Latitude 13. Also thanks for the suggested software unknowdevice been looking for something like that.

  17. Thanks! It is work on Dell e6510

  18. thank you so much, it works for studio 1557.

  19. Worked for Dell Precision M4500. I spent hours scouring the internet and contacting Dell to no avail until I found this. Thank you so much for posting this…

  20. Thank you so much!! This was the only problem I had left ..and it worked great for the XPS 15 I just bought when I upgraded the OS.

  21. Thanks! You are a lifesaver and a timesaver! M4500 laptop

  22. VERY NICCEEE !! =D works perfectly on E5410 for the unknown device ! really thankss xD =D

  23. got it working on latitude e6410 and e4310.


  24. “Thanks alot, it was indeed the freefall sensor (Dell M4500).”


  25. yeah man, this article rocks!!!

    Thanks dude!! (Latitude E6510)

  26. l8nytalumni October 16, 2010 at 3:12 pm · ·

    thanks for the help! :)

  27. Thank you, I had this problem after reinstallin a Dell E6510 with 64bit Win7, it had come with 32bit installed and the instructions and driver setting from Dell didn’t help me with this “Unknown Device”. I did a search on acpi SMO8800 and found your post.


  28. DanoTheITGuy September 23, 2010 at 2:33 pm · ·

    Dude!! Thanks!!!

  29. It works. Thanks.


  31. Thanks for this. I did a google search for the ACPI\SMO8800 and this was the first site I found. It helped with the Latitude E6410 I was having problems with. Thanks again.

  32. That was the ticket. Thanks

  33. Thanks alot, it was indeed the freefall sensor (Dell M4500).

  34. worked great for studio 17 also its located on the cd. I just needed to know that this was the motion sensor…. gesh the hours I wasted

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